Error (175001): Could not place ATX PLL - Error (175001): Could not place ATX PLL Description Due to a problem in the Quartus® II software version 12.1 and later, you may see fitter problems placing the ATX PLL when migrating from earlier versions of the Quartus II software. Resolution To work around this problem, add the Quartus II Settings File ( .qsf ) assignment for all related ATX_PLLs set_instance_assignment -name XCVR_TX_PLL_RECONFIG_GROUP 1 -to **atx_pll.tx_pll Custom Fields values: ['novalue'] Troubleshooting 123456 Old KDB False ['novalue'] ['FPGA Dev Tools Quartus II Software'] novalue 12.1 ['Programmable Logic Devices'] ['novalue'] ['novalue'] ['novalue']